An incredible behaviour has been observed in the Bükk Mountains of Hungary. Great tits (Parus major) developed the habit of hunting down and killing bats for food. Scientists are quite taken aback, for these nice little passerines were not expected to be able to predate on prey as large as pipistrelle bats. The behaviour is most likely a ‘cultural phenomenon’, that is one of them made a hit by trial and error and, being quick-learners, the new type of food acquisition quickly spread through the population.
See more on this in BBC News (with a grisly photo of a half-eaten bat) and Times Online. The original results appear today in the journal Biology Letters.
Geophagus 
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